DSpace Collection:http://hdl.handle.net/10204/9362016-12-09T17:30:44Z2016-12-09T17:30:44ZDefining the Blue economySmith-Godfrey, Shttp://hdl.handle.net/10204/87812016-10-03T21:55:15Z2016-01-01T00:00:00ZTitle: Defining the Blue economy
Authors: Smith-Godfrey, S
Abstract: Oceans are increasingly gaining in importance in terms of enabling international trade via linking sellers and buyers. The behaviour patterns of such linking enablers on the oceans are receiving more attention from a regulatory and economic perspective as the relationship between land and ocean evolves in its role and importance. The “Blue Economy” as a concept finds its origin against this background. A literature review is undertaken to analyse an appropriate definition for the Blue Economy. These definitions are analysed in terms of the minimum criteria which are necessary for a Blue Economy. The paper also attempts to structure various types of activities which are associated with ocean services. It is done with a view to identify what one may perceive as the focus areas for the growth of the Blue Economy.
Description: Copyright: 2015 Taylor& Francis. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website.2016-01-01T00:00:00ZIn vitro screening for endocrine disruptive activity in selected South African harbours and river mouthsTruter, JCvan Wyk, JHNewman, BKhttp://hdl.handle.net/10204/87632016-09-07T21:55:22Z2015-12-01T00:00:00ZTitle: In vitro screening for endocrine disruptive activity in selected South African harbours and river mouths
Authors: Truter, JC; van Wyk, JH; Newman, BK
Abstract: Various waterborne anthropogenic contaminants disrupt the endocrine systems of wildlife and humans, targeting reproductive pathways, among others. Very little is known, however, regarding the occurrence of endocrine disruptive activity in South African freshwater ecosystems, and coastal ecosystems have not been studied in this regard. In a first attempt to investigate endocrine disruptive activity in South African coastal waters, surface water samples collected from harbours, river mouths and estuaries in three metropolitan municipalities, eThekwini (which includes Durban), Nelson Mandela (specifically Port Elizabeth Harbour) and City of Cape Town, were screened for (anti) oestrogenicity and (anti)androgenicity using recombinant yeast bioassays. Moreover, levels of the female hormone 17ß-(o)estradiol (E2) were determined in all samples, as well as a selection of hydrocarbons in the eThekwini samples. A high proportion of samples collected from eThekwini were oestrogenic, whereas none from Port Elizabeth Harbour and only a single river mouth sampled in the City of Cape Town were oestrogenic. E2 was detected in all the samples tested, but at higher concentrations at the eThekwini and City of Cape Town localities than Port Elizabeth Harbour. In addition, the recombinant yeast assays revealed that anti-androgenicity was widespread, being detected in the majority of samples screened apart from those representing Port Elizabeth Harbour. Conversely, no anti-oestrogenic or androgenic activity was detected. Anti-androgenicity did not associate with hydrocarbon loads, providing evidence that other anti-androgens were responsible for the observed activity. The present data suggest potential reproductive disruption in marine and estuarine fauna inhabiting the eThekwini and City of Cape Town regions.
Description: Copyright: 2015 National Inquiry Services Centre (NISC). Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in African Journal of Marine Science, vol, 37(4), p.p. 567-5742015-12-01T00:00:00ZCoastal flooding levels in South AfricaTheron, ARautenbach, CMaherry, ARossouw, Mhttp://hdl.handle.net/10204/87622016-09-07T21:55:19Z2015-04-22T00:00:00ZTitle: Coastal flooding levels in South Africa
Authors: Theron, A; Rautenbach, C; Maherry, A; Rossouw, M
Abstract: The study for the CSIR & DEA – Phases 1 & 2 Research Study: South African Coastal Vulnerability Assessment present on the Coastal flooding levels in South Africa.
Description: CoastGIS 2015: Rich Data, Poor Data: Geospatial Creativity and Innovation for Managing Changing Coastal Systems, Cape Town, 22-24 April 20152015-04-22T00:00:00ZVessel grounding in entrance channels: case studies and physical model testsTulsi, KPhelp, DO’Connor, Phttp://hdl.handle.net/10204/87212016-08-22T21:55:19Z2014-05-01T00:00:00ZTitle: Vessel grounding in entrance channels: case studies and physical model tests
Authors: Tulsi, K; Phelp, D; O’Connor, P
Abstract: Physical model studies were conducted of a 250K DWT fully laden iron ore vessel grounding on the side slopes of the outbound channel at a major Australian port. A key deliverable of the study was to estimate the tug force required to pull the vessel off the channel slope and back into the entrance channel. The tests were conducted at the Coastal & Hydraulics Laboratory, of the CSIR in Stellenbosch, South Africa. Simulated vessel grounding was modelled in a hydraulic basin at a scale of 1:100. Over the course of the ship grounding simulation, the actual scenario was modelled as well as various other possibilities of groundings using two channel profiles, four different approach angles, and vessel grounding speeds ranged between 2 and 12 knots. It was found that high speed impacts of 8 to 12 knots at 10° to the channel side slopes have the potential to damage the hull and require enormous tug forces to re-float the grounded vessel.
Description: Copyright: 2014 Permanent International Association of Navigation Congresses (PIANC). Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website.2014-05-01T00:00:00ZUbiquitous presence of Fe(II) in aquatic colloids and its association with organic carbonvon der Heyden, BPHauser, EJMishra, BMartinez, GABowie, ARTyliszczak, TMtshali, TNRoychoudhury, ANMyneni, SBChttp://hdl.handle.net/10204/86762016-07-20T21:55:16Z2014-08-01T00:00:00ZTitle: Ubiquitous presence of Fe(II) in aquatic colloids and its association with organic carbon
Authors: von der Heyden, BP; Hauser, EJ; Mishra, B; Martinez, GA; Bowie, AR; Tyliszczak, T; Mtshali, TN; Roychoudhury, AN; Myneni, SBC
Abstract: Despite being thermodynamically less stable, small ferrous colloids (60 nm to 3 µm in diameter) remain an important component of the biogeochemical cycle at the Earth’s surface, yet their composition and structure and the reasons for their persistence are still poorly understood. Here we use X-ray-based Fe L-edge and carbon K-edge spectromicroscopy to address the speciation and organic–mineral associations of ferrous, ferric, and Fe-poor particles collected from sampling sites in both marine and freshwater environments. We show that Fe(II)-rich phases are prevalent throughout different aquatic regimes yet exhibit a high degree of chemical heterogeneity. Furthermore, we show that Fe-rich particles show strong associations with organic carbon. The observed association of Fe(II) particles with carboxamide functional groups suggests a possible microbial role in the preservation of Fe(II). These finding have significant implications for the behavior of Fe(II) colloids in oxygenated waters, and their role in different aquatic biogeochemical processes.
Description: Copyright: 2014 American Chemical Society. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Environmental Science & Technology Letters, 1(10), 387-3922014-08-01T00:00:00ZThe shifting sands of coastal flood management in South AfricaSlinger, JHHermans, LMCunningham, SWTaljaard, Svan Niekerk, LVreugdenhil, Hhttp://hdl.handle.net/10204/86382016-07-20T21:55:20Z2013-01-01T00:00:00ZTitle: The shifting sands of coastal flood management in South Africa
Authors: Slinger, JH; Hermans, LM; Cunningham, SW; Taljaard, S; van Niekerk, L; Vreugdenhil, H
Abstract: In this paper, the authors do not examine the safety of these coastal systems and the vulnerability of estuaries to flooding from the usual engineering, environmental science or public administration perspective. Instead, the authors adopt a game theory and policy analysis lens and explore the evolution of policy in this regard to flooding safety and estuary management have influenced the conceptual basis of, and choices for, mouth breaching in association with artificial flood releases as the preferred management approach for a particular estuary, the Great Brak Estuary, from 1989 onwards (Slinger et al. 2005). They highlight the alignment of the concept underpinning the new South African national water and coastal policies with the estuary management choices made over the last twenty-five years. This enables us to distinguish four phases and identify the dominant justifications for current and past interventions. They explain the shifting sands of estuarine mouth breaching and flooding policy in terms of three game rounds.
Description: Copyright: Taylor & Francis: London, UK. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website.2013-01-01T00:00:00Z